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WDS in StorTrends iTX: Compression and Data Deduplication for WAN
Asynchronous Replication
AMI offers these WDS features as an integral part of the StorTrends iTX stack, which
can be enabled or disabled through a robust feature licensing capability. Designed to
provide the most efficient and optimal asynchronous replication capability, WDS does so
through powerful data reduction (or data deduplication) and WAN acceleration features.
In order to minimize the amount of data transported over WAN links, StorTrends iTX
offers two types of data reduction features: compression and data deduplication.
Whereas compression is a pervasive and therefore well understood technology,
deduplication is much more of an emerging concept, and is considered to be something of
a 'Holy Grail' for StorTrends storage appliances. This section will explain the data
deduplication implementation of StorTrends iTX for WAN replication.
Like many of its competitors, StorTrends employs delta-snapshot technology to transfer
only the data that has changed between passes in order to reduce the amount of data
transported. In addition to this, StorTrends also employs an intelligent data-dedupe
algorithm to filter out some of the previously transmitted data from earlier passes. This
technique provides significant benefits for database applications, in particular.
At its most basic level, StorTrends iTX employs an optimal delta-snapshot replication
technology for the implementation asynchronous replication; the figure below illustrates
the concept.
Figure 5:The Delta Snapshot Replication Technology behind Asynchronous Replication in
StorTrends iTX
Appendix J : WDS and Deduplication in StorTrends iTX 259
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